diff --git a/src/Commands/RemindCommandGroup.cs b/src/Commands/RemindCommandGroup.cs
index 263d1ba..d437b5d 100644
--- a/src/Commands/RemindCommandGroup.cs
+++ b/src/Commands/RemindCommandGroup.cs
@@ -85,7 +85,7 @@ public class RemindCommandGroup : CommandGroup
         }
 
         var builder = new StringBuilder();
-        for (var i = 0; i < data.Reminders.Count; i++)
+        for (var i = data.Reminders.Count - 1; i >= 0; i--)
         {
             var reminder = data.Reminders[i];
             builder.AppendLine(
@@ -168,8 +168,7 @@ public class RemindCommandGroup : CommandGroup
     [RequireContext(ChannelContext.Guild)]
     [UsedImplicitly]
     public async Task<Result> ExecuteDeleteReminderAsync(
-        [Description("Index of reminder to delete")]
-        [MinValue(0)]
+        [Description("Index of reminder to delete")] [MinValue(0)]
         int index)
     {
         if (!_context.TryGetContextIDs(out var guildId, out _, out var userId))
diff --git a/src/Services/GuildDataService.cs b/src/Services/GuildDataService.cs
index 796b598..296377a 100644
--- a/src/Services/GuildDataService.cs
+++ b/src/Services/GuildDataService.cs
@@ -46,7 +46,8 @@ public sealed class GuildDataService : IHostedService
     {
         _logger.LogInformation("Saving guild data...");
         var tasks = new List<Task>();
-        foreach (var data in _datas.Values)
+        var datas = _datas.Values.ToArray();
+        foreach (var data in datas)
         {
             await using var settingsStream = File.Create(data.SettingsPath);
             tasks.Add(JsonSerializer.SerializeAsync(settingsStream, data.Settings, cancellationToken: ct));
@@ -54,7 +55,8 @@ public sealed class GuildDataService : IHostedService
             await using var eventsStream = File.Create(data.ScheduledEventsPath);
             tasks.Add(JsonSerializer.SerializeAsync(eventsStream, data.ScheduledEvents, cancellationToken: ct));
 
-            foreach (var memberData in data.MemberData.Values)
+            var memberDatas = data.MemberData.Values.ToArray();
+            foreach (var memberData in memberDatas)
             {
                 await using var memberDataStream = File.Create($"{data.MemberDataPath}/{memberData.Id}.json");
                 tasks.Add(JsonSerializer.SerializeAsync(memberDataStream, memberData, cancellationToken: ct));
diff --git a/src/Services/Update/MemberUpdateService.cs b/src/Services/Update/MemberUpdateService.cs
index 472f844..631cc50 100644
--- a/src/Services/Update/MemberUpdateService.cs
+++ b/src/Services/Update/MemberUpdateService.cs
@@ -63,7 +63,8 @@ public sealed partial class MemberUpdateService : BackgroundService
         var guildData = await _guildData.GetData(guildId, ct);
         var defaultRole = GuildSettings.DefaultRole.Get(guildData.Settings);
         var failedResults = new List<Result>();
-        foreach (var data in guildData.MemberData.Values)
+        var memberDatas = guildData.MemberData.Values.ToArray();
+        foreach (var data in memberDatas)
         {
             var tickResult = await TickMemberDataAsync(guildId, guildData, defaultRole, data, ct);
             failedResults.AddIfFailed(tickResult);