My advice is avoid tape backups. The cost, risk of media degredation, and management overhead make them not worth it, especially for a homelab.

Also, restoring an entire VM is almost easier than recovering a single file, just because of the sequential nature of reading data from a tape. Data recoveries are pretty slow in general.

I backup to an external hard drive with regular copies to iDrive S3. Been doing it that way for a number of years with no problems.