Dropbox or equivalent is probably the only possibility to store your catalog file in a networked manner, but this makes sense only if you access the same pictures on the same (local NAS) disk. The problem with this is naturally that nobody can ensure the integrity of the data base if, by mischance, you access the database with 2 computers at the same time. Lightroom is not multi-user ready. And that is why Chetna reminds not to store the catalog on a network drive. I have the following hardware: NAS - for Backups (9Tb) 6 TB Photo disk on my Workstation and 2 TB USB3 disk for my Laptop. My workflow is, that most of the time, I import and develop on my Laptop. For that reason, I have a catalog database on my external disk. When I'm at my base office, I import that catalog database (import from catalog) into my workstation's catalog database. The story here is, that I have a first backup of my most recent data and I can continue working the pictures on my workstation. A backup is then scheduled from my workstation disk to my NAS. My current pictures database (2015+2016) is currently around 1TB, my overall database of pictures dating 10 years back (to the beginning of my digital area) is around 2 TB. Additionally, I have an additional TB of scanned data from my analogue life. This works best for me at the moment. For the corrupt data problem: You may try to recover from a backup catalog. Best practice would be anyway to store those somewhere else in your disk space.
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