So far we have 3 branches located in different region, around 5-10 employees per branch with their own laptop

Some problems I found is whenever laptop crash or need to be reinstalled, it will be pain in ass since we only have 1 IT guy, which is me, in the main branch (it will take around 3-4 hours of commuting to reach other branch and fix it for them)

Also we store our data at one master GDrive and share the files to each employee, but I found it difficult for the employee to search the stored data, since the shared files will be in shortcut form, not the actual data itself and windows can't search the file content, this will be pain in ass for my sales person since they need to search the file's content for specific invoice or customer name

Is there any selfhosted tool that can make my life easier as the only IT guy in this company?