While Consulting for a Business doing about +20Cr (3M USD) revenue, It was a challenge to have full-fledged IT team to manage the Network and other IT related stuff.
The Primary issue was the Accounting Package “Tally ERP9” a popular Accounting Package which is licensed as a server with multi user but lacked remote connectivity but for “tally.net” which used a ddns server hosted by tally. Tally now provides a sync facilities but expects each of the branch to buy a lic..? which requires to renewed every year.
There are many hardware suppliers like Cisco, Netgear etc which provide VPN Routers like RV80 or VPN FireWall from Netgear again these are licensed per connection. They are worth the buck but involves issues beyond a small business person. To find a skilled person on VPN tunnel is also quite a challenge.