What are the main considerations for backing up a large photo library?
First of all you should always follow the 3-2-1 backup rule.
- At least 3 separate backups
- On at least 2 different devices
- At least one backup off site, so outside of your home.
You should also make sure that you take backups regularly and that you have a plan to restore the backup and you test that plan. A backup that you can't restore is a useless backup. It is also very useful to automate your backups so that they will be up to date.