I already am using almost 4tb just for backup. 2TB for all of my files in NAS. As I wrote above I will most probably move my Nextcloud instance storage there so I will be already using 6TB of storage. With built-in instant replication between nodes in garage I should have instant backup of my files.

Right now I do not have time, but it would be nice to move storage all of my services there so in case of trouble with one server I could instantly spin them up on other machine by mounting S3 storage. Performance probably wont be great but if main machine will go down I will be still able to use my home automation for example on some secondary without much of a hassle.

Anyway having dedicated server and backup storage for 30$/mo does not seem unreasonable.