I have an IoSafe for normal backup that appears to be failing. I also periodically back up on a G-Force that I keep off-premises. The IoSafe has been backing up every hour for several years. Any recommendations for a reliable replacement? Thank you.
What sort of backup, files, TM (Tome Machine), bootable clone? What OS are you running? For bootable clones, the latest, MacOS 10.15, Catalina, requires an SSD, but TM backups should go to spinners (HDDs). If you're just backing up images, either type of drive will serve, and triple redundancy is not out of line.
I like to use external enclosures that allow me to hot swap drives at will. That allows me to copy drives and/or replace any that fail, at will, and continue to use the enclosure. I hate sealed enclosures that don't allow access and/pr replacement of the drive itself. It's less expensive to buy naked drives than it is to buy enclosures with the drive sealed inside, plus you get a much wider choice of drives to choose from.
Buying naked drives also eliminates the software that comes loaded on packaged drives in sealed enclosures. There is good software out there for backups, such as CCC (Carbon Copy Cloner), as well as other SW choices. The Mac has it's own TM backup software, and I would recommend a drive used for TM to be restricted tp TM exclusively due to the speed with which it can fill up the available drive space.