As with any computer or files you use, you should be backing up your Mendeley collection periodically in case your computer has problems.
In Mendeley Reference Manager:
In Mendeley Desktop:
Please note: This backup should be stored in your local drive. If you try to recover this backup in the future from Mendeley Desktop and the folder is linked to a cloud-based drive or folder, you may experience serious database recovery issues.
To see the size of your Mendeley account:
A free Mendeley account allows you 2GB personal storage for personal documents. If you are above these limits, please contact our Citation Management Team.