I’m trying to backup QNAP TS-464 to External Drive. When I plug in an external drive I get the screen with “Open and view files”, “View external storage settings”, and “edit access permissions”, but it is missing the “Use this drive for backup” option.
What drive is it?
What file system is it using?
QNAP TS-464-8G-48WD-US 4 Bay High-Performance Desktop NAS with 24TB Storage Capacity, Preconfigured RAID 5 WD Red Plus HDD Bundle
I plugged a Seagate Portable 5TB External Hard Drive HDD into the USB port in the back of the NAS.
Windows 11
Is there a “use for backup” option?
If the file system can be written to, the QNAP will create a mounted share for each drive partition and that can be used in HBS3
It was the actual file system type that I was asking about 
Are you trying to use / configure the “One Touch Copy” function?
If so, then you need to use the front USB port only as far as I know (I don’t personally use the One Touch option, just as regular storage with HBS3).
Quote from the user manual.
USB One Touch Copy button The USB One Touch Copy button allows you to copy data backups from a USB device to the NAS or from the NAS to a USB device. This feature supports incremental backups. The NAS only copies files that were modified or added after the last backup. To configure the behavior of the button when an external device is connected to the button’s USB port, install and use Hybrid Backup Sync on your QNAP operating system. For details, see the Hybrid Backup Sync documentation
If you are using the REAR USB port, then you should have appropriate options in HBS3 to use the storage, depending on how you have configured the portable drive (partitions and file system).
If this isn’t what you are expecting or looking for, maybe you can try and describe what you expect or want to do further?
I tried the front USB and got the same response. I’m wanting to be able to back up the NAS to an external drive occasionally or on a weekly basis. I’m looking for the option circled in yellow.
This doesn’t respond directly to your post, I don’t know what triggers that option to appear or not appear, maybe you clicked the “Do not ask me again” option already?
But, can’t you just follow the normal directions (this is what I use) without that popup?
https://www.qnap.com/en/how-to/faq/article/how-to-i-back-up-to-an-external-storage-device-in-hbs
Again though, it may have something to do with the unspecified structure/filesystem on the external drive.
Obsolete. In theory that option shouldn’t be there.
https://www.qnap.com/en-gr/how-to/faq/article/why-backup-station-is-gone
Hello,
i have no problem with my TS-264
Do you use a admin-user ?
https://www.qnap.com/en/how-to/faq/article/why-cant-i-access-external-drives-after-plugging-them-in
Yes, I’m the admin. I checked and have read/write to all drives.
The seagate portable is probably exFat by default, not native support by QNAP. Do you need it to be compatible with MAC ? If so, there appears to be a special driver to purchase.
If not, ONLY IF IT’S BRAND NEW - then plug it into a Windows machine and reformat it as NTFS.
( if it’s not new, backup the content because reformat will erase it; afterwards you can reload the built-in software drivers from Seagate if you need them )
exFAT has been fully-supported (for free) since QTS 5 was released.
It’s been partly-supported (with a license) since about QTS 4.3.0
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NTFS support in Linux has always been a little-flakey. Blame MS for not releasing all the specifications. 
Better to stick with exFAT.
Have you considered trying HBS3? Thanks!