I have been using the solution for a few months.

I used the solution for six months at my prior employer. 

I have used MSP360 Backup within the last 12 months.

We have been using MSP360 Backup for two to three years.

I have been using MSP360 Backup for three months.

I have been using MSP360 Backup for a year and a half. 

I've been working with this solution for almost two years.

I've been using the solution for about three years at this point. It's been a while. I'm using it right now.

I have been using this solution for five to six years. 

I've been dealing with the solution for about a year, or maybe even a little longer than that.

I have been using Cloudberry Backup for around the last six to eight months.

We've been using the solution for about one year.