One benefit of custom software as a web based solution is easier software upgrades, patches and backups are vital to keep a business running, Cloud applications have most of this built in. This works well in successfully helping you save on IT support expenses. Cloud software is also in most cases on a simple monthly subscription, instead of a large up-front expense. There will be no more need to manage IT in-house. Rather, skilled professionals will be doing it for you.
Patches and updates are only required to be applied on the server computer instead of each computer using the software. Custom software solutions, because changes are quite often made on request, tend to be updated more regularly then off-the-shelf software. As such, a web best solution is quickly updated without (noticeable or less) down-time for the end-user.